// let age = 18
// let name = "zs"
// console.log(typeof age)
// console.log(typeof name)
// console.log(name.toUpperCase())

// function changeNameToUpper(xxx){
//     let a = xxx.toUpperCase()
//     return a
// }
// let res =changeNameToUpper(name)
// console.log(res)


// let res1 = changeNameToUpper(age)